From the bestselling author of the generation-defining series The Baby-sitters Club comes a series for a new generation!The big mix-upKaren has a new doll. And it’s not just any old doll. Karen’s baby doll came all the way from London, England. She was very expensive. Karen has to be extra careful with her. When Karen’s best friend Nancy gets sick, Karen has a great idea. She gives her doll to Nancy until she feels better. But Nancy thinks the doll is for keeps! What will Karen do?